Milwaukee® Thunderbolt® Secure-Grip™ Jobber Length Drill Bit, General Purpose, Imperial, 5/16 in Drill - Fraction, 0.3125 in Drill - Decimal Inch, 4-1/2 in Overall Length, 3-3/16 in Cutting Depth, Parabolic Flute, 3-3/16 in Flute Length, 3-Flat Shank, 135 deg Point, Split Point, Right Hand Cutting Direction, HSS Cutting Edge, HSS, Black Oxide, Applicable Materials: Metal, Plastic and Wood